期刊
IEEE JOURNAL OF SOLID-STATE CIRCUITS
卷 56, 期 7, 页码 2171-2181出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2020.3043669
关键词
1/f noise; Magnetometers; Immune system; Magnetic sensors; Biosensors; Sensitivity; Magnetoresistance; Magnetic immunoassay (MIA); magnetic sensor; relaxometry; sensor analog front-end (AFE); Zoom ADC
资金
- National Science Foundation [ECCS-1454608]
- Qualcomm
This article presents a low-noise magnetic sensor front-end with an 18-bit Zoom ADC for detecting temporal magnetic nanoparticle relaxation. Utilizing techniques like dynamic element matching and magnetoresistive correlated double sampling, it achieves state-of-the-art noise performance and a significantly improved figure-of-merit compared to previous sensor and AFE designs. Implemented in a 0.18um CMOS process, the design consumes 4.32mW from a 1.8V supply.
This article reports a low-noise magnetic sensor front-end with an 18-bit Zoom ADC for detecting temporal magnetic nanoparticle (MNP) relaxation. Techniques such as dynamic element matching (DEM) and magnetoresistive correlated double sampling (MRCDS) are proposed to remove the sensor and analog front-end (AFE) 1/f noise while a fast-settling Miller compensation (FSMC) technique is proposed to reduce the amplifier power. Collectively, these result in state-of-the-art input-referred noise performance (9.7 nT(rms)) and a figure-of-merit (FoM) that is 6.6x and 210x better than previously reported magnetic sensor and relaxation-based AFEs, respectively. A relaxation-based magnetic immunoassay (MIA) was performed to demonstrate the concept. This design is implemented in a 0.18-mu m CMOS process and consumes 4.32 mW from a 1.8-V supply.
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